Li-Ion Rechargeable 18650 3.7V 2,600mAh Battery
Genuine Samsung Battery Core with automatic short circuit protection.
This battery can be recharged over 1,000 times with little power loss during the life cycle. It is an extremely powerful battery with Automatic Short Circuit Protection located on the bottom.  The Circuit on the battery will shutoff the battery instantly when a short is detected.  Do not use the battery if the plastic cover is damaged in any way. Follow all warnings on the battery. Keep battery away from children.